/*
 * Copyright (C) 2012 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package it.sephiroth.android.library.exif2;

/**
 * The rational data type of EXIF tag. Contains a pair of longs representing the
 * numerator and denominator of a Rational number.
 */
public class Rational {

	private final long mNumerator;
	private final long mDenominator;

	/**
	 * Create a Rational with a given numerator and denominator.
	 *
	 * @param nominator
	 * @param denominator
	 */
	public Rational( long nominator, long denominator ) {
		mNumerator = nominator;
		mDenominator = denominator;
	}

	/**
	 * Create a copy of a Rational.
	 */
	public Rational( Rational r ) {
		mNumerator = r.mNumerator;
		mDenominator = r.mDenominator;
	}

	/**
	 * Gets the numerator of the rational.
	 */
	public long getNumerator() {
		return mNumerator;
	}

	/**
	 * Gets the denominator of the rational
	 */
	public long getDenominator() {
		return mDenominator;
	}

	/**
	 * Gets the rational value as type double. Will cause a divide-by-zero error
	 * if the denominator is 0.
	 */
	public double toDouble() {
		return mNumerator / (double) mDenominator;
	}

	@Override
	public boolean equals( Object obj ) {
		if( obj == null ) {
			return false;
		}
		if( this == obj ) {
			return true;
		}
		if( obj instanceof Rational ) {
			Rational data = (Rational) obj;
			return mNumerator == data.mNumerator && mDenominator == data.mDenominator;
		}
		return false;
	}

	@Override
	public String toString() {
		return mNumerator + "/" + mDenominator;
	}
}
